Door assembly

ABSTRACT

The invention relates to a set of doors for closing off a bay ( 6 ) in a wall ( 4 ), comprising a first flexible door ( 1 ) and a second door ( 2 ) having at least a rigid bottom edge ( 17 ), it being possible to impart an upward movement and a downward movement to each of these doors ( 1, 2 ) respectively into an open position and a closed position, the second door ( 2 ) being disposed so as to create a slit ( 31 ) between the wall ( 4 ) and the rigid bottom edge ( 17 ) of this second door ( 2 ) as it is moved upwards into the open position. The flexible door ( 1 ) is disposed at least partially between said second door ( 2 ) and said wall ( 4 ) and can be displaced through said slit ( 31 ) between its closed position and its open position when the second door ( 2 ) is in the open position.

The invention relates to a set of doors for closing off a bay in a wall,comprising a first flexible door and a second door having a rigid bottomedge, it being possible to displace each of these doors in an upward anda downward motion between an open position and a closed position, thesecond door being arranged so that the bottom edge moves apart from thewall during its upward motion towards the open position, creating a slitbetween the wall and the bottom edge of this second door.

Said second door is provided in the form of a sectional door, forexample, made up of a succession of rigid sections articulated one aboutthe other. When this second door is in its closed position, the sectionsand the bottom edge of the door fit against the wall, whilst in the openposition, a slit is created between the part of the wall located abovethe bay and the bottom edge of the door.

Currently known sets of doors are of a relatively cumbersome and complexconstruction. Furthermore, these known sets of doors do not enable asealed closure to be obtained when the flexible door is in the closedposition and said second door is in the open position. In particular,spaces are left, through which insects, an air flow or dust are able topenetrate the enclosure closed off by this set of doors. In practice, itis relatively complicated to make a set of doors which providessatisfactory sealing.

Document U.S. Pat. No. 2,501,454 describes a set of two doors, each ofwhich is wound on a drum to enable them to be opened. An attempt hasbeen made to provide a seal between the wall and the set of these doorsby mounting a housing above the bay in which said drums are enclosed.Naturally, mounting such a housing is relatively complex and it is notpossible to use such a housing if one of these doors is not wound on adrum. This might be the case, for example, if the second door is a rigiddoor or a sectional door.

One of the essential objectives of the present invention is to propose aset of doors that is rather less cumbersome and of a very simpleconstruction. Furthermore, this set of doors must offer a very effectiveand simple way of obtaining complete sealing when one of the doors ofthis set is closed.

To this end, the invention proposes a flexible door which is arranged atleast partially between said second door and the above-mentioned wall,it being possible to displace this flexible door through said slitbetween its closed position and its open position when the second dooris in the open position.

In one specific embodiment of the set of doors proposed by theinvention, when said second door is in its open position whilst saidflexible door is being displaced into its closed position or into itsopen position, the latter, as it is displaced, is supported against aguide surface provided on the wall above the bay and/or at the bottomedge of the second door.

In one specific embodiment of the invention, the flexible door has ashutter, the side edges of which are guided relative to guide trackscrossing through said slit between the wall and the bottom edge of thesecond door.

Advantageously, when said second door is in the open position with saidflexible door in its closed position, it is in contact with the wallabove the bay and forms a seal between this wall and the flexible dooron the one hand and on the other hand is supported against the bottomedge of the second door in order to maintain said contact, therebyproviding the aforementioned seal.

For practical purposes, the guide tracks form a seal between the walland said second door when it is in the closed position.

In one practical embodiment of the set of doors proposed by theinvention, the bottom edge of the second door is provided with a guidesurface enabling the door with the flexible shutter to slide on thisedge as the shutter is moved upwards or downwards.

Advantageously, the wall located above the bay is provided with a guidesurface, enabling the door with the flexible shutter to slide relativeto this wall as the shutter is moved upwards or downwards.

In one very practical embodiment of the set of doors proposed by theinvention, the door with the flexible shutter is provided with a sealingelement extending substantially across the entire width of the flexibledoor, which extends between the door and the wall located above the baywhen the flexible door is in the closed position, forming a seal betweenthis wall and this door.

In a practical manner, the flexible door is provided with a sealingelement extending essentially across the entire width of the flexibledoor which, when the flexible door is in the closed position, extendsbetween this door and the bottom edge of the second door so that theflexible door is clamped between the wall and this bottom edge.

Other details and features of the invention will become apparent fromthe description given below, which is not intended to be restrictive, ofvarious specific embodiments of a set of doors as proposed by theinvention, with reference to the appended drawings.

FIG. 1 is a diagram in section, showing a set of doors in a firstembodiment proposed by the invention, with a sectional door in theclosed position and a flexible door in the open position.

FIG. 2 is a section through line II-II indicated in FIG. 1.

FIG. 3 is a section identical to that illustrated in FIG. 1, in whichthe sectional door is in the open position and the flexible door is inthe closed position.

FIG. 4 is a diagram in section, showing a set of doors in a secondembodiment proposed by the invention, with a sectional door in theclosed position and a flexible door in the open position.

FIG. 5 is a section identical to that shown in FIG. 4, in which thesectional door is in the open position and the flexible door is in theclosed position.

FIG. 6 is a diagram in section, on a larger scale, along line VI-VIindicated in FIG. 4.

FIG. 7 is a diagram in section, on a larger scale, along line VII-VIIindicated in FIG. 5.

FIG. 8 is a diagram in section identical to that of FIGS. 6 and 7, inwhich the flexible door and the sectional door are in the open position.

FIG. 9 is a detail showing the part of the set of doors illustrated inFIG. 4 above the bay.

FIG. 10 is a detail showing the part of the set of doors illustrated inFIG. 5 above the bay.

FIG. 11 is a detail of the part above the bay, showing the embodiment ofthe set of doors proposed by the invention illustrated in FIGS. 4 to 10,in which the flexible door and the sectional door are in the openposition.

FIG. 12 is a detail of the part above the bay showing the set of doors,in which the flexible door is provided with a flap and is in the closedposition.

FIG. 13 is a detail of the part above the bay showing the set of doors,in which the flexible door is provided with a thickened section and isin the closed position.

FIG. 14 is a very schematic front view of the set of doors proposed as asecond embodiment of the invention.

FIG. 15 is a diagram in section showing a set of doors in anotherembodiment proposed by the invention, with a sectional door in theclosed position and a flexible door in the open position.

FIG. 16 is a section along line XVI-XVI indicated in FIG. 15.

FIG. 17 is a section along the line XVII-XVII indicated in FIG. 15.

FIG. 18 is a diagram in section of the set of doors illustrated in FIGS.15 to 17, when the sectional door is in the open position and theflexible door is in the closed position.

FIG. 19 is a section along the line XIX-XIX indicated in FIG. 18.

FIG. 20 is a diagram in section showing a set of doors as proposed bythe invention, comprising a pivoting door and a flexible door.

The same reference numbers are used in the different drawings to denotethe same or similar elements.

Generally speaking, the present invention relates to a set of doors forclosing off a bay in a wall. This set of doors comprises a firstflexible door and a second door, arranged one behind the other, toenable the bay to be closed off by one of these doors when the otherdoor is open.

The use of such a set of doors is particularly practical in situationswhere said second door is a rigid door, the displacement of whichbetween the closed position and the open position is relatively slow. Ifthere is a relatively high density of people or traffic passing throughthis bay, opening and closing this rigid door incurs a considerable lossof time since it is necessary to wait for this rigid door to open. Thepresence of a flexible door which can be closed and opened at arelatively high speed eliminates this disadvantage. Accordingly, therigid door is placed in its open position if a relatively high amount ofpassing traffic is expected and this door is placed in the closedposition at night, when no traffic is expected.

Using a flexible door has an additional advantage insofar as such a doorrequires only a relatively small amount of mounting space.

Advantageously, the flexible door has a shutter, the side edges of whichpreferably co-operate with guide tracks provided at either side of thebay, so that the bay can be closed off by this shutter. The word“shutter” is intended to be construed within the scope of the presentinvention as meaning any planar element of a slim thickness, which is atleast partially pliable, flexible, optionally with one or moretransverse stiffeners, such as a canvas, a screen to keep out mosquitoesor other insects, a strip of plastics material, a tarpaulin, a grill ora metal sheet, etc.

However, it should be pointed out that particular preference is given toflexible shutters provided in the form of a canvas, for example.

Accordingly, the figures illustrate a shutter consisting of a canvas,the side edges of which are provided with a bead or a succession ofsmall rigid blocks, articulated one about the other.

FIGS. 1 to 3 illustrate a first embodiment of the set of doors proposedby the invention, comprising a flexible door 1 and a rigid door 2, whichcan be used to close off a bay 3 in a wall 4.

The flexible door 1 comprises a shutter 9 and two guide tracks 5 and 6extending on either side of the bay 3, in which the side edges 7 and 8of the shutter 9 are guided as this shutter 9 is displaced between aclosed position and an open position. At a level above the bay 3, a drum10 is provided, about which the shutter 9 is wound as it is moved intothe open position or from which it is unwound as it is displaced intothe closed position. Advantageously, driving means are provided for thispurpose, although they are not illustrated in the drawing.

The guide tracks 5 and 6 are preferably mounted in an elasticarrangement relative to the wall 4 so that as the shutter 9 is beingdisplaced into the closed position, these guide tracks 5 and 6 areautomatically moved towards one another to ensure that the distancebetween them corresponds to the width of the shutter 9. When theflexible door 1 is open and the shutter 9 is therefore wound around thedrum 10, the guide tracks 5 and 6 automatically recoil so as to bespaced at a distance apart, due to their elastic mounting, so that theyare not in the bay 3.

The rigid door 2, which is provided as a sectional door comprising asuccession of sections 11 articulated one about the other, mainlyextends along the flexible door 1 in such a way that the latter isarranged between this rigid door 2 on the one hand and the bay 3 and thewall 4 on the other.

At the point where the sections 11 are articulated one about the other,rollers 12 are provided, which are guided in matching guide tracks 13and 14. These guide tracks 13 and 14 extend substantially vertically oneither side of the bay 3, curve on a level with the top part of the bay3 and then extend transversely relative to the wall 4.

The guide tracks 5 and 6 of the flexible door 1 are disposed between theguide tracks 13 and 14 of the rigid door 2 and the wall 4.

Accordingly, the guide tracks 5 and 6 of the flexible door 1 form a sealbetween the wall 4 and the rigid door 2 when the latter is in the closedposition, as schematically illustrated in FIG. 2. In particular, whenthe rigid door is in the closed position, the side edges of the sections11 are supported against the guide tracks 5 and 6 of the flexible door1, preferably slightly compressing these guide tracks 5 and 6, which aremade from a slightly elastic material.

When the flexible door 1 is in the open position, the bottom edge 16 ofthe shutter 9 is disposed above the bay 3 between the top section 11 ofthe rigid door 2 and the wall 4, thereby forming a seal between therigid door and the wall 4 located above the bay 3. In particular, thebottom edge 16 of the shutter 1 is clamped between the wall 4 and thecorresponding section 11 of the rigid door when the latter is in itsclosed position. For this reason, the bottom edge 16 of the shutter 1preferably has an elastic bead extending across substantially the entirewidth of the shutter 1.

As the rigid door 2 is opened, the bottom edge 17 of this door is movedslightly away from the wall 4 so that the shutter 9 of the flexible doorcan be readily displaced through the slit 31 thus created between thewall 4 and the bottom edge 17 of the rigid door 2. This slit 31therefore appears only when the rigid door 2 is open and is not presentwhen this door is closed.

When the rigid door 2 is in the open position and the flexible door 1 isin the closed position, it is important that the latter should be in aposition to provide a sealed closure of the bay 3. To this end, the partof the shutter 1 extending in the region of the bottom edge 17 of therigid door, when the latter is in the open position, can be supportedagainst this bottom edge 17. This therefore prevents any space frombeing formed between the shutter 9 and the wall 4 above the bay 3. Sucha space might be produced if the shutter 9 were moved away from the wall4 above the bay 3 when subjected to a flow of air or slight pressure,for example.

In order to ensure that the shutter 9 remains in permanent contact withthe wall 4 above the bay 3 when the flexible door is in the closedposition, a guide surface is advantageously provided on this wall 4,extending across substantially the entire width of the shutter 1. Thisguide surface is provided in the form of a thickened section 18, forexample, disposed at the point above the bay 3 where the shutter 1 comesinto contact with the wall 4. Consequently, this thickened section onthe one hand ensures that the shutter 9 slides with a minimum offriction as the shutter is being closed or opened and on the other handprovides a seal between the shutter 9 and the wall 4.

Similarly, a guide surface may be provided on the bottom edge 17 of therigid door 2, to enable the shutter 9 to slide on this bottom edge 17 asthe shutter 9 is moved down or up.

FIGS. 4 to 11 illustrate a second embodiment of the set of doorsproposed by the invention, with a conventional sectional door and aflexible door 1, in which the guide tracks 5 and 6 of the latter aremounted in the bay 3. This is illustrated in FIGS. 6, 7 and 8.

The guide tracks 5 and 6 of the flexible door specifically comprise aprofiled section with two parallel flanges linked to one another intheir longitudinal direction by a central cross-piece, this section thushaving a H-shaped cross section. The edges of one of the flanges arebent towards the facing edges of the other flange so as to form twochannels 19 and 20. The corresponding edge 7 or 8 of the shutter 9 canbe displaced in one of these channels 19 during opening or closure ofthe flexible door 1 whilst a mounting strip 21 is fixed in the otherchannel 20.

This mounting strip 21 is mounted in the bay 3 on the wall 4. Asillustrated in the drawings, the mounting strip 21 has side edges 22 and23 which are thicker than the part of the strip 21 disposed betweenthese edges 22 and 23. The mounting strip 21 is mounted in the region ofan edge 23 on the wall in the bay 3 by means of a mounting batten 24 sothat the mounting strip 21 is clamped between the mounting batten 24 andthe wall 4. The other edge 22 of the mounting strip 21 is retained inthe corresponding channel 20 of said section.

The mounting strip 21 is made from a flexible and preferably elasticmaterial, such as an elastomer, polypropylene or polyurethane. Saidsection is preferably made from a relatively flexible material to enablethis section to bend and flex slightly and maintain a uniform tension onthe shutter.

When the flexible door 1 and the rigid door 2 are open, as illustratedin FIG. 8, the mounting strip 21 is extended so that it is locatedoutside the bay 3.

When the flexible door 1 is being closed by the downward movement of theshutter 9, the width of which is shorter than the width of the bay 3,the sections at the two sides of the bay 3 are gradually moved closer toone another, flexing the corresponding mounting strips 21. This isillustrated in FIG. 7. Given that the mounting strips 21 have a tendencyto extend, the shutter 9 always remains substantially taut when it is inthe closed position.

When the flexible door 1 is being closed by the upward movement of theshutter 9, the mounting strips 21 gradually resume their extendedposition, as illustrated in FIG. 8.

When the flexible door 1 is open and the rigid door is in the closedposition, as illustrated in FIG. 6, the mounting strip 21 is flexed andis supported, with said section, against the surface of the sections 11of the rigid door 2. The mounting strip 21 and this section thereforeform a seal between the wall 4 and the rigid door 2.

FIGS. 5 and 10 illustrate the set of doors proposed by the invention,with the rigid door in the open position and the flexible door in theclosed position. The bottom edge 17 of the rigid door 2 is provided witha guide surface in the form of a cylinder 25, which may optionallyundergo a rotation about its axis, and which extends along this bottomedge 17 across a distance substantially corresponding to the width ofthe shutter 9. In a practical manner, this cylinder 25 is provided inthe form of a succession of coaxial rollers. This guide surface enablesthe shutter 9 to slide against this bottom edge 17 of the rigid door 2with minimum friction as the shutter 9 is moved into its closed positionor open position.

In addition, the shutter 9 is supported against this guide surface, orin particular against the cylinder 25, when it is closed, preventing aspace from being formed between shutter 9 and the part of the wall 4located above the bay 3.

This part of the wall 4 located above the bay 3 is also provided with aguide surface in the form of a cylinder 25, on which the shutter 9 isable to slide as it is displaced into the closed or open position.

In order to ensure that a seal is provided between the shutter 9 and thebottom edge 17 of the rigid door 2 on the one hand and the wall 4located above the bay 3 on the other, the shutter 9 is provided with asealing element 26. This sealing element 26 extends substantially acrossthe entire width of the shutter 9 at the point of the latter facing thebottom edge 17 of the rigid door 2 when the latter is in its openposition and the flexible door 1 is in the closed position.

Accordingly, this sealing element 26 is clamped between the bottom edge17 of the rigid door and the part of the wall 4 above the bay 3, thusproviding the desired seal.

The sealing element 26 may be provided in the form of a compressibleflap 27, as illustrated very schematically in FIG. 12. This flap 27flattens out as the shutter 9 is wound on the drum 10 in order to openthe bay 3 and reverts to its initial shape as the shutter is unwoundfrom the drum 10 into its closed position.

FIG. 13 illustrates an alternative embodiment of the sealing element 26.The sealing element specifically consists of a bead 28 made from anelastic material, which is clamped between the wall and the bottom edgeof the second door when the latter is in the open position, whilst saidflexible door is in its closed position.

To enable the shutter 9 to be displaced in an upward and downwardmovement, driving means are provided, consisting of a rack wheel 29co-operating with a rack 30 extending along the side edge of theshutter, as illustrated very schematically in FIG. 7. The rack wheel 29is located above the guide tracks 13 and 14 of the rigid door 2 and iscontrolled by an electric motor, not illustrated.

The guide tracks 5 and 6 of the flexible door 1 extend as far as theregion in the vicinity of this rack wheel 29. Since the width of theshutter 9 is shorter than the distance between the guide tracks 5 and 6by which the shutter 9 is guided, these guide tracks 5 and 6 areslightly twisted together in the region between the bay 3 and the rackwheel 29 when the flexible door 1 and the rigid door 2 are in their openposition. The bottom part of the shutter 9 and the bottom edge 16 arealways retained in the guide tracks 5 and 6. This is schematicallyillustrated in FIGS. 11 and 14. The dotted-dashed lines in FIG. 14specifically illustrate the path of the guide tracks of the flexibledoor 1, whilst the bay 3 is indicated by broken lines.

As the flexible door 1 is being opened, the shutter 1 can be wound onthe drum or the shutter 9 may be extended above the horizontal part ofthe guide tracks 13 and 14 of the rigid door, as illustrated veryschematically in FIGS. 4 to 11.

In a very practical manner, the set of doors proposed by the inventionmay be set up using an existing door with at least one rigid bottomedge. For example, if a sectional door is provided in front of a bay, itis possible to mount a flexible door between this existing door and thewall. In particular, when an upward movement is imparted to thesectional door to bring it into its open position, this sectional doormoves away from the wall, thus creating a slit between the wall abovethe bay and the bottom edge of the door in its open position. This slitis generally of a width in the order of 1 to 4 cm.

The set of doors proposed by the invention is then set up by mountingtwo guide tracks for the flexible door on either side of the bay,extending through said slit between the bottom edge of the sectionaldoor and the part of the wall located above the bay. A drum for windinga shutter is mounted on the wall above the bay, for example, so that theshutter can be displaced through said slit between a closed position andan open position when the sectional door is in the open position.

Accordingly, a flexible door is mounted, which co-operates with thesectional door, maintaining the original height of the passageunderneath the sectional door when the latter is in its open position.

FIGS. 15 to 19 illustrate such a set of doors. As illustrated in FIGS.15 and 16, when the sectional door 2 is in the closed position, itextends against the wall 4 around the bay 3, forming a seal between thiswall 4 and the sectional door 2. As the sectional door 2 is movedupwards into the open position, the sections 11 of this door graduallymove away from the wall 4. Consequently, as explained above, a slit 31is created between the wall 4 and the bottom edge 17 when the sectionaldoor is in the open position, as illustrated in FIGS. 17 and 18.

The flexible door 1, comprising a shutter 9 in the form of a canvas, ismounted between the sectional door 2 and the wall 4 so that the guidetracks 5 and 6 of the flexible door 1 extend through said slit 31 and isdisplaced through the slit 31 as the shutter 9 is moved upwards ordownwards between its closed position and its open position.

In the embodiment of the invention illustrated in FIGS. 15 to 19, theguide tracks 5 and 6 of the flexible door 1 are mounted in the samemanner as described with reference to FIGS. 4 to 11.

When the sectional door 2 is in its closed position, the top section 11′of this door is slightly inclined relative to the wall 4. Accordingly, aspace is formed between the wall 4 and this top section 11′, throughwhich the guide tracks 5 and 6 of the flexible door 1 extend.

At the top edge 33 of the top section 11′, a flexible seal 32 isprovided, extending along this section 11′ between the latter and thewall 4 when the sectional door 2 is in its open position. When thesectional door 2 is closed, this seal is elastically deformed at thepoint where the guide tracks 5 and 6 of the flexible door 1 pass throughthe space between the wall 4 and the sectional door 2, as schematicallyillustrated in FIG. 17. Accordingly, a seal is obtained between the topsection 11′ of the sectional door 2 and the wall 4, even though theguide tracks 5 and 6 of the flexible door 1 are disposed between thissection 11′ and the wall 4.

Naturally, the top section 11′ need not necessarily be inclined relativeto the wall 4 when the sectional door 2 is in the closed position. Forexample, a cutout may be provided in this top section 11′ or in the wall4 in the region of the guide tracks 5 and 6 of the flexible door 1 wherethe latter are accommodated when the sectional door 2 is in its closedposition.

Since the slit 31 between the wall 4 and the bottom edge 17 of thesectional door 2 is used to guide the shutter 9 of the flexible door 1,the driving means, comprising a drum 10, for the flexible door 1 may bemounted above the sectional door 2. Accordingly, the original height ofthe passage through the bay 3 underneath the sectional door 2 is notreduced by mounting a flexible door as proposed by the invention.

FIG. 20 illustrates another embodiment of a set of doors as proposed bythe invention. This set of doors comprises a flexible door 1 and a rigiddoor 2, consisting in particular of a conventional pivoting door such asused to close a garage, for example. When this rigid door 2 is closed,it conforms to the wall 4 in the bay 3 in a sealing arrangement, whereaswhen this rigid door 2 is open, as illustrated in FIG. 20, a slit 31appears between the rigid bottom edge 17 of the latter and the part ofthe wall 4 located above the bay 3.

Guide tracks 5 and 6 are mounted in the bay 3 and extend through saidslit 31. When the shutter 9 of the flexible door 1 is displaced betweenthe open position and the closed position, the latter is supportedagainst the bottom edge 17 of the rigid door 2 and against the wall 4above the bay 3. Accordingly, the shutter 9 is guided through the slit31.

In an alternative embodiment of the set of doors proposed by theinvention, a flexible sealing flap is provided, which is mounted alongthe rigid bottom edge 17 of the second door 2. When the second door isin the open position, this flap seals the slit 31 between the rigidbottom edge 17 and the wall 4. As the shutter 9 of the flexible door 1is moved downward into its closed position, this flap is flexed due tothe action of the bottom edge 16 of the shutter 9 so that the latter isguided between the wall 4 and the flap.

When the second door is in the closed position, the flap forms the sealbetween the bottom edge 17 of this door and the ground.

Naturally, the invention is not limited to the embodiments describedabove and illustrated in the appended drawings and other variants wouldbe conceivable without departing from the scope of the presentinvention.

For example, the aforementioned profiled section and the mounting strip21 may be an integral piece.

Although the embodiments described all relate to a set of doors with afirst flexible door and a second door provided as a sectional door orpivoting door, it is clear that this second door may be a door of anytype having a rigid or semi-rigid bottom edge. In particular, thissecond door might be a flexible door with a rigid bottom edge, forexample.

Under certain circumstances, the guide track 5 or 6 of the flexible doormay be provided in the form of a bead, around which the correspondingside edge 7 or 8 of the shutter 9 conforms.

1. Set of doors for closing off a bay (3) in a wall (4), comprising a first flexible door (1) and a second door (2) having at least a rigid bottom edge (17), it being possible to impart an upward movement and a downward movement to each of these doors (1, 2) respectively, between an open position and a closed position, the second door (2) being arranged so as to create a slit (31) between the wall (4) and the rigid bottom edge (17) of this second door (2) as it is moved upwards into the open position, the flexible door (1) being arranged at least partially between said second door (2) and said wall (4), it being possible to displace this flexible door (1) through the slit (3) between its open position and its closed position when the second door (2) is in the open position, characterised in that, if said second door (2) is in the open position whilst said flexible door (1) is in its closed position, the latter is supported against the bottom edge (17) of the second door (2).
 2. Set as claimed in claim 1, characterised in that if said second door (2) is in the open position whilst said flexible door (1) is in its closed position, the latter is in contact with the wall (4) above the bay (3) forming a seal between this wall (4) and the flexible door (1) on the one hand and is supported against the bottom edge (17) of the second door (2) on the other, in order to maintain said contact and thus form said seal.
 3. Set as claimed in claims 1 or 2, characterised in that the flexible door (1) is provided with a sealing element (26) extending across substantially the entire width of the flexible door (1), which, when the flexible door (1) is in the closed position, extends between this door (1) and the wall (4) located above the bay (3) forming a seal between this wall (4) and this door (1).
 4. Set as claimed in claim 1, characterised in that it has a sealing element (26) extending along substantially the entire width of the flexible door (1) which, when the latter is in the closed position, extends between this door (1) and the bottom edge (17) of the second door (2) so that the flexible door (1) is clamped between the wall (4) and this bottom edge (17).
 5. Set as claimed in claim 3, characterised in that the sealing element (26) is a flap (27) which extends between the wall (4) and the flexible door (1) when the flexible door (1) is in the closed position.
 6. Set as claimed in claim 3, characterised in that the sealing element (26) is a thickened section (28) made from an elastic material, which is clamped between the wall (4) and the bottom edge (17) of the second door (2) when the latter is in the open position whilst said flexible door (1) is in its closed position.
 7. Set as claimed in claim 1, characterised in that, when said second door (2) is in the open position, as said flexible door (1) is displaced towards its closed position or towards its open position, it is supported during its displacement against a guide surface provided on the wall (4) above the bay (3) and/or on the bottom edge (17) of the second door (2).
 8. Set as claimed in claim 7, characterised in that the bottom edge (17) of the second door (2) is provided with said guide surface (25), enabling the flexible door (2) to slide on this edge (17) as it is moved upwards or downwards.
 9. Set as claimed in claims 7 or 8, characterised in that the wall (4) located above the bay (3) is provided with said guide surface (25), enabling the flexible door (1) to slide relative to this wall (4) as it is moved upwards or downwards.
 10. Set as claimed in claims 8, characterised in that the guide surface comprises at least one cylinder (25), the axis of which extends substantially transversely to the direction of displacement of the flexible door (1) as it is moved downwards or upwards.
 11. Set as claimed in claim 1, characterised in that the flexible door (1) comprises a shutter (9), the side edges (7, 8) of which are guided relative to guide tracks (5, 6) passing through said slit between the wall (4) and the bottom edge (17) of the second door (2).
 12. Set as claimed in claim 11, characterised in that said guide tracks (5, 6) extend at least partially in the bay (3) or at the side of the latter opposing that directed towards the second door (2).
 13. Set as claimed in claim 11 or 12, characterised in that the guide tracks (5, 6) are elastically and/or pivotably mounted relative to the wall (4).
 14. Set as claimed in claim 11, characterised in that the guide tracks (5, 6) constitute seals between the wall (4) and said second door (2) when the latter is in the closed position.
 15. Set of doors for closing off a bay (3) in a wall (4), comprising a first flexible door (1) and a second door (2) having at least a rigid bottom edge (17), it being possible to impart an upward movement and a downward movement to each of these doors (1, 2) respectively, between an open position and a closed position, the second door (2) being arranged so as to create a slit (31) between the wall (4) and the rigid bottom edge (17) of this second door (2) as it is moved upwards into the open position, the flexible door (1) being arranged at least partially between said second door (2) and said wall (4), it being possible to displace this flexible door (1) through the slit (3) between its open position and its closed position when the second door (2) is in the open position, characterised in that, when said second door (2) is in the open position, as said flexible door (1) is displaced towards its closed position or towards its open position, it is supported during its displacement against a guide surface provided on the wall (4) above the bay (3) and/or on the bottom edge (17) of the second door (2).
 16. Set as claimed in claim 15, characterised in that the bottom edge (17) of the second door (2) is provided with said guide surface (25), enabling the flexible door (2) to slide on this edge (17) as it is moved upwards or downwards.
 17. Set as claimed in claims 15 or 16, characterised in that the wall (4) located above the bay (3) is provided with said guide surface (25), enabling the flexible door (1) to slide relative to this wall (4) as it is moved upwards or downwards. 